CVE-2017-6766 Security feature bypass in Cisco Firepower System Software
An unauthenticated remote attacker can bypass SSL decryption and inspection policies by sending crafted SSL packets, allowing malicious traffic to pass uninspected.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2017-6766?
CVE-2017-6766 is a high-severity vulnerability in Cisco Firepower System Software, published on 7 Aug 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A vulnerability in the Secure Sockets Layer (SSL) Decryption and Inspection feature of Cisco Firepower System Software 5.4.0, 5.4.1, 6.0.0, 6.1.0, 6.2.0, 6.2.1, and 6.2.2 could allow an unauthenticated, remote attacker to bypass the SSL policy for decrypting and inspecting traffic on an affected system. The vulnerability is due to unexpected interaction with Known Key and Decrypt and Resign configuration settings of SSL policies when the affected software receives unexpected SSL packet headers. An attacker could exploit this vulnerability by sending a crafted SSL packet through an affected device in a valid SSL session. A successful exploit could allow the attacker to bypass the SSL decryption and inspection policy for the affected system, which could allow traffic to flow through the system without being inspected. Cisco Bug IDs: CSCve12652.
Weakness: CWE-310
Which versions are affected by CVE-2017-6766?
It affects 1 product.
Products include Cisco Firesight System Software.
How do I fix CVE-2017-6766?
No fix has been published for CVE-2017-6766 yet. Limit exposure of the affected software until one is available.
Is CVE-2017-6766 being exploited?
There is no known exploitation of CVE-2017-6766 in the wild and no public exploit code.
Other vulnerabilities in Cisco Firepower System Software
Sources
Also known as GHSA-q3pq-v78p-xj7q.